1.

A sugar 'X' on heating dehydrated very slowly and form furfural which react with resorcinol/HCI and give coloured compound than compound 'X' will be.(1) Aldopentose (2) Aldoketose(3) Ketotetrose(4) Oxalic acid 

Answer»

Correct option is (1) Aldopentose ​​​​​​

This is seliwanoff test use to identify Aldose and Ketose. Ketose rapidly dehydrated and give dark Red color with resorcinol & HCI but Aldose give light pink colour.



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